Decarb
The oil-rich mixture will eventually cause lot's of carbon build-up on the rings and pistons, leading to stuck rings and even detonation from glowing carbon on top of pistons, so doing the decarb bit can head off lots of problems. OMC had some stuff you sprayed in the carbs with motor running at idle and then let it soak for an hour or so, and then run it hard to blow it out. I'm sure Merc has something similar, and I think Sea Foam does the same thing. Haven't kept up with this as BRP says no need for decarb on the E-Tec's if you run the XD-100 full synthetic oil since they seem to run about 100-150:1 oil mix overall and maybe about 300:1 at idle!
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